Re: Wonderings--Isaac and Invest 90L
Posted by Chris in Tampa on 9/6/2012, 10:24 pm
Just a correction, it is 90L that is the area over the Gulf.

Isaac got a lot better organized before landfall and there was no other low with him at that time. I forget what happened between Isaac and the other part of the broad low pressure system it was part of. I can't say for sure that some low while Isaac was around was somewhere, though not anywhere close, might have met up with him after landfall, but I think it simply developed. I forget where that other low came from over Cuba, but it may have simply popped up as well. It happens.

I'm not sure I would say that Isaac and that other low were part of a Fujiwhara interaction though. I don't think that is a good example on the Wikipedia page:
http://en.wikipedia.org/wiki/Fujiwhara_effect

Fujiwhara-ish I guess you could say, but I really think it needs to be two tropical cyclones. NOAA defines the "Fujiwhara Effect" as:

"The tendency of two nearby tropical cyclones to rotate cyclonically about each other."

From: http://www.nhc.noaa.gov/aboutgloss.shtml#f

From same page:

"Tropical Cyclone:
A warm-core non-frontal synoptic-scale cyclone, originating over tropical or subtropical waters, with organized deep convection and a closed surface wind circulation about a well-defined center. Once formed, a tropical cyclone is maintained by the extraction of heat energy from the ocean at high temperature and heat export at the low temperatures of the upper troposphere. In this they differ from extratropical cyclones, which derive their energy from horizontal temperature contrasts in the atmosphere (baroclinic effects)."

So it would really be between two lows that were both at least tropical depressions or higher.
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Wonderings--Isaac and 10L - freesong, 9/6/2012, 9:37 pm
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